Matus UHLAR - fantomas writes:

>> > In addition my SMTP server does *not* support 8-bit MIME for
>> > incoming e-mail.

>> That's very uncommon and lot of mail will be probably rejected
>> due to this.

> are there known problems with mailers that can send/receive
> 8-bit but can't encode to QP or base64?

exim causes such problems; it is not MIME aware and won't be able
to make such a conversion. So it will either violate RFC 2821
(which is done already by exim when generating bounces, btw), or
it will abort delivery when it does not see an '250-8BITMIME'
EHLO response.